1. Department of Materials Science and Engineering, Korea University, Seoul 136-701, Republic of Korea
2. Department of Biomedicine and Health Sciences, College of Medicine, The Catholic University of Korea, Seoul 03083, Republic of Korea
3. Department of Plastic and Reconstructive Surgery, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul 06591, Republic of Korea
4. Department of Biomedical Engineering, College of Medicine, Catholic University of Korea, Seoul 03083, Republic of Korea
5. Institute for Advanced Engineering, Yongin-si 17180, Republic of Korea